murdoch's nowty funk "news of the world". >> i would say they're aware of 5% of what journalists are up to. >> reporter: morgan testified via a video link from los angeles. he denied any knowledge of illegal phone hacking. >> have you listened to recordings of what you knew to be illegally obtained voice mail messages? >> i do not believe so, no. >> well, you either did or you didn't. it isn't a question of belief. >> reporter: today a former business reporter for "the daily mirror" who went to jail for insider trading says hacking regularly took place while morgan was editor. >> i would say that it was very unlikely that he didn't know that it was going on, because as i've said, he was -- there wasn't very much he didn't know about. >> reporter: during his testimony, morgan was repeatedly asked how he heard a phone message paul mccartney left for his then wife heather mills as their marriage was falling apart. >> well, i can't discuss where i was played that tape or who played it, because to do so would be to compromise a source. >> reporter: there were moments when the cnn anchor a